FCC ID: 2A4BG-AIRHUG03 USB Bluetooth adapter

ATS2831 Dongle usage instructions 1. Background and application scenario description With bluetooth speakers, the popularity of bluetooth headset, wireless brought great convenience into people's life, so he went to the cable is a major trend of the current consumer electronics industry, and the integrity of the bluetooth technology with its agreement, universality, standard, and the intelligent device on congenital advantage, has become the preferred one of wireless communication technology, for the PC, Through the USB sound card output, can achieve free drive, than through the ordinary Bluetooth Dongle output in PC compatibility and ease of use. The following is a list of common scenarios, but not limited to these scenarios. This solution can be used in any scenario similar to that in which the PC pushes audio to the Bluetooth As shown in Figure 1 below, it is mainly applied to the scenario where the computer pushes the audio to the Bluetooth speaker headset through Bluetooth, or carries out voice chat or call or holds teleconferencing through the Bluetooth speaker headset. Figure 1 receiver. As shown in Figure 2 below, it is mainly used in teleconferencing system, which is equivalent to eliminating the microphone line of traditional telephone system and making the microphone part wireless. Figure 2 As shown in Figure 3 below, it is mainly applied in the home living room scenario, where the sound of the TV is transmitted to the Bluetooth speaker or earphone through the Dongle. Figure 3 2. Schematic diagram The schematic diagram of this case is shown in Figure 4 below. The computer is connected to Don gle through USB Audio, and dongle is connected to Bluetooth speaker or earphone through Bluetoot h A2DP or HFP. In other words, music on the computer can be pushed to Bluetooth speaker or ear phone. Or use bluetooth speaker or headset through chat software or teleconferencing software and friends for voice calls, through USB HID and Bluetooth AVRCP, Bluetooth speaker or headset can a lso do some control on PC playback. 4 3. Function Description:

requirements note function Supports Bluetooth 5.0 protocol Support USB Audio transmission Usb Audio supports hands-free voice calls Voice calls support common voice and HD voice audio AVRCP Bluetooth transmission supports control Bluetooth supports digital volume adjustment when transmitting audio Bluetooth supports volume synchronization for Bluetooth supports the 5.0 core protocol and the Bluetooth Profile

(A2DP, HFP) related to dongle for voice calls. The PC sends the audio playback data to the Dongle through the USB Audio channel, and the Dongle sends the data to the receiving device (speaker or headset) through the Bluetooth A2DP. One end of the Dongle is connected to a PC through a USB Audio channel, and the other end is connected to a Bluetooth SPEAKER or headset through a Bluetooth HFP as an AG, enabling the phone to be hands-free using a Bluetooth speaker or headset. Voice calls support common voice (8K sampling rate, CVSD codec) and WBS (broadband voice: 16K sampling rate and MSBC codec). The receiver can control the transmitting end by AVRCP to play, pause, bend up and down switch, etc During Bluetooth transmission, if the connected Bluetooth speaker does not support volume synchronization, you can adjust the digital volume of the sent data. Supports volume synchronization between the receiver and transmitter, that is, the receiver and transmitter use the same volume. audio transmission or voice calls 4. Bluetooth protocol support agreement Plan calls for BQB needs note Core Bluetooth protocol version A2DP version A2DP SRC role AVRCP version AVRCP TG SRC role HFP version HFP AG SRC role V5.0 V1.3 support V1.6 support V1.7 support support support support support support support support 5. Bind and connect 1) Insert the Dongle into the USB port on the PC 2) Select USB Dongle as the default sound card on PC according to the following operations 3) Turn on the Bluetooth speaker or earphone, and press the pairing button (some speakers or earphones do not need it, please refer to the product manual for details) to enter the pairing mode 4) Place a Bluetooth speaker or headset close to the Dongle, preferably within 0.5 meters to improve the pairing success rate, and wait for the pair to be connected to the nearest Bluetooth speaker or headset 5) when the dongle and bluetooth speakers or headset paired automatically connected to the speakers or headset, bluetooth speakers or headphones after being connected, will have a speech or prompt, if is not sure whether the connection is successful, can open players play songs in the PC terminal, if after the success of the bluetooth connection, you can play the song sounds on speakers or headphones 6) When the Bluetooth connection is successful, the device will be bound, and the device will be connected by default when the next startup 6. AVRCP control If the speaker or headset has "Next", "Prev", "Play/Pause" keys and supports Bluetooth AVRCP, you can press the "Next", "Prev" keys on the speaker or headset to switch the PC player to "Next, previous". You can press Play/Pause to pause or continue the player on the PC. 7call 8The volume synchronization 9The connection The Dongle can support calls with wechat, QQ, Skyp and other conference software on PC. The following uses wechat as an example to explain how to use the dongle. Other communication tools are similar:

Open wechat on the PC and initiate a voice chat with your friends. Enter the voice chat interface for normal voice chat. Then the other party's voice will be played on the speaker or earphone. If a Bluetooth speaker or headset has a volume button and supports volume synchronization, you can adjust the volume on the PC by pressing the volume button on the speaker or headset, no matter when playing music or talking. After the device is connected to the system for the first time, the system remembers the name of the last device before the device is disconnected. After the device is powered on again, the system automatically enters the connection back state. If the device cannot be connected back within 15 seconds, the system automatically enters the search and pairing state. 10. Indicators corresponding to each state 1) Search pairing: red and blue lights flash alternately, 2) Back connection: blue light flashes once every one second 3) Successful connection: blue light flashes once every 5 seconds. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

-- Reorient or relocate the receiving antenna.

-- Increase the separation between the equipment and receiver.

-- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

-- Consult the dealer or an experienced radio/TV technician for help. The device has been evaluated to meet general RF exposure requirement. The device can be u sed in portable exposure condition without restriction FCC ID: 2A4BG-AIRHUG03

C5266091_X10_Ed.2 Feifan Innovation E-commerce (Shenzhen) Co.,Ltd. ffice of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 Date:

Jan.20.2021 Subject: Request for Confidentiality FCC ID: 2A4BG-AIRHUG03 To Whom It May Concern, Pursuant to the provisions of Sections 0.457 and 0.459 of Commission's rules

(47CFR0.457, 0.459), we are requesting the Commission to withhold the following attachment(s) as confidential document from public disclosure. Exhibits ID Label/Location Attestation Statement External Photos Block Diagram Schematics Test Report Test Setup Photos Users Manual Internal Photos Parts List / Tune Up RF Exposure Info Operational Description Cover Letter(s) SDR Software / Security Info Long-Term Confidentiality No No No No No NOTE 1 NOTE 1 No No Short-Term Confidentiality NOTE 2 No No No No No No NOTE 1: Long-Term Confidentiality may be permitted under special conditions (See II. LONG-TERM CONFIDENTIALITY, Section 3 of KDB 726920, use last in force) NOTE 2: Short-Term Confidentiality can be requested for a maximum of 180 days from the date of the grant. Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. In case of short-term Confidentiality, the applicant requests the exhibits selected above are withheld from public view for a period of ____45__ days from the date of the Grant of Equipment Authorization and prior to marketing. It is our understanding that all measurement test reports, FCC ID label format and correspondent during certification review process cannot be granted as confidential documents and those information will be available for public review once the grant of equipment authorization is issued. 1/1 C5266091_X10_Ed.2 Sincerely, Signature:

Name: Iyun Zheng Title: Customer Service 1/1

C5266091_X8_Ed.1 Letter of Authorization Feifan Innovation E-commerce (Shenzhen) Co.,Ltd. Company: Feifan Innovation E-commerce (Shenzhen) Co.,Ltd. Address: 602, Complex Building No.3 of Baoyunda Logistics Center, Fuhua community, Xixiang Street, Baoan District, Shenzhen, China Product Name: USB Bluetooth adapter Model Number: AIRHUG 03 FCC Identifier: 2A4BG-AIRHUG03 We authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, to act on our behalf on all matters concerning the above named equipment. Any individual within LGAI Technological Center S.A. is authorized to act on our behalf and take action on the application. We declare that authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, is allowed to forward all information related to the approval project to the Federal Communication Commission and to discuss any issues concerning the approval application. Any and all acts carried out by LGAI Technological Center S.A. on our behalf shall have the same effect as acts of our own. Name: Iyun Zheng Title: Customer Service Date: Jan.20.2022 Signature of applicant:

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